4.4 Article

Drivers of vegetation change in grasslands of the Sheffield region, northern England, between 1965 and 2012/13

Journal

APPLIED VEGETATION SCIENCE
Volume 19, Issue 2, Pages 187-195

Publisher

WILEY-BLACKWELL
DOI: 10.1111/avsc.12206

Keywords

Acidic grassland; Atmospheric N deposition; Calcareous grassland; Grazing; Land-use change; Pteridium aquilinum

Funding

  1. NERC BESS small grant [NE/K015389/1]
  2. NERC [NE/K015389/1, ceh020002] Funding Source: UKRI
  3. Natural Environment Research Council [NE/K015389/1, ceh020002] Funding Source: researchfish

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Questions: How has vegetation species diversity and species composition changed between 1965 and 2012/13 in acidic and calcareous grasslands? What has driven this change in vegetation? Location: A 2400-km(2) area around Sheffield, northern England. Methods: In 1965 a survey was conducted to describe grassland vegetation of the Sheffield region. We repeated this survey in 2012/13, revisiting acidic and calcareous grassland sites (455 quadrats). Climate, N and sulphur deposition, cattle and sheep stocking rates, soil pH, altitude, aspect and slope were considered to be potential drivers of variation in vegetation. We analysed temporal changes in vegetation and examined relationships with spatial and temporal variation in driver variables. Results: Both acidic and calcareous grasslands showed clear changes in species composition between the two time periods. In acidic grasslands there was no significant change in richness but there were declines in diversity. There were significant increases in Ellenberg N. Nitrogen deposition and grazing were identified as potential drivers of spatial and temporal patterns but it was not possible to discriminate the respective impacts of potential drivers. In calcareous grasslands there were declines in species richness, diversity and appropriate diversity indices. Climate and soil pH were identified as potential drivers of spatial and temporal patterns. Conclusions: Despite only small site losses compared to other surveys in the UK, especially within the national park, both calcareous and acidic grasslands showed very clear changes in species composition. In acidic grasslands, high abundance of Pteridium aquilinum was a particular problem and had increased considerably between the two survey periods. Atmospheric N deposition and grazing were identified as drivers of species diversity. A number of calcareous grasslands showed signs of reduced management intensity leading to scrub invasion.

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